18397480 has 16 divisors (see below), whose sum is σ = 41394420. Its totient is φ = 7358976.

The previous prime is 18397471. The next prime is 18397481. The reversal of 18397480 is 8479381.

It can be written as a sum of positive squares in 2 ways, for example, as 16990884 + 1406596 = 4122^2 + 1186^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 459937 = 18397480 / (1 + 8 + 3 + 9 + 7 + 4 + 8 + 0).

It is not an unprimeable number, because it can be changed into a prime (18397481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229929 + ... + 230008.

Almost surely, 2^18397480 is an apocalyptic number.

18397480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18397480 is an abundant number, since it is smaller than the sum of its proper divisors (22996940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18397480 is a wasteful number, since it uses less digits than its factorization.

18397480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459948 (or 459944 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18397480 is about 4289.2283688328. The cubic root of 18397480 is about 263.9891715791.

The spelling of 18397480 in words is "eighteen million, three hundred ninety-seven thousand, four hundred eighty".